Mini Shell
# Copyright (C) 2003-2006 Robey Pointer <robeypointer@gmail.com>
#
# This file is part of paramiko.
#
# Paramiko is free software; you can redistribute it and/or modify it under the
# terms of the GNU Lesser General Public License as published by the Free
# Software Foundation; either version 2.1 of the License, or (at your option)
# any later version.
#
# Paramiko is distributed in the hope that it will be useful, but WITHOUT ANY
# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
# A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
# details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with Paramiko; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
import stat
import time
from paramiko.common import x80000000, o700, o70, xffffffff
class SFTPAttributes:
"""
Representation of the attributes of a file (or proxied file) for SFTP in
client or server mode. It attempts to mirror the object returned by
`os.stat` as closely as possible, so it may have the following fields,
with the same meanings as those returned by an `os.stat` object:
- ``st_size``
- ``st_uid``
- ``st_gid``
- ``st_mode``
- ``st_atime``
- ``st_mtime``
Because SFTP allows flags to have other arbitrary named attributes, these
are stored in a dict named ``attr``. Occasionally, the filename is also
stored, in ``filename``.
"""
FLAG_SIZE = 1
FLAG_UIDGID = 2
FLAG_PERMISSIONS = 4
FLAG_AMTIME = 8
FLAG_EXTENDED = x80000000
def __init__(self):
"""
Create a new (empty) SFTPAttributes object. All fields will be empty.
"""
self._flags = 0
self.st_size = None
self.st_uid = None
self.st_gid = None
self.st_mode = None
self.st_atime = None
self.st_mtime = None
self.attr = {}
@classmethod
def from_stat(cls, obj, filename=None):
"""
Create an `.SFTPAttributes` object from an existing ``stat`` object (an
object returned by `os.stat`).
:param object obj: an object returned by `os.stat` (or equivalent).
:param str filename: the filename associated with this file.
:return: new `.SFTPAttributes` object with the same attribute fields.
"""
attr = cls()
attr.st_size = obj.st_size
attr.st_uid = obj.st_uid
attr.st_gid = obj.st_gid
attr.st_mode = obj.st_mode
attr.st_atime = obj.st_atime
attr.st_mtime = obj.st_mtime
if filename is not None:
attr.filename = filename
return attr
def __repr__(self):
return "<SFTPAttributes: {}>".format(self._debug_str())
# ...internals...
@classmethod
def _from_msg(cls, msg, filename=None, longname=None):
attr = cls()
attr._unpack(msg)
if filename is not None:
attr.filename = filename
if longname is not None:
attr.longname = longname
return attr
def _unpack(self, msg):
self._flags = msg.get_int()
if self._flags & self.FLAG_SIZE:
self.st_size = msg.get_int64()
if self._flags & self.FLAG_UIDGID:
self.st_uid = msg.get_int()
self.st_gid = msg.get_int()
if self._flags & self.FLAG_PERMISSIONS:
self.st_mode = msg.get_int()
if self._flags & self.FLAG_AMTIME:
self.st_atime = msg.get_int()
self.st_mtime = msg.get_int()
if self._flags & self.FLAG_EXTENDED:
count = msg.get_int()
for i in range(count):
self.attr[msg.get_string()] = msg.get_string()
def _pack(self, msg):
self._flags = 0
if self.st_size is not None:
self._flags |= self.FLAG_SIZE
if (self.st_uid is not None) and (self.st_gid is not None):
self._flags |= self.FLAG_UIDGID
if self.st_mode is not None:
self._flags |= self.FLAG_PERMISSIONS
if (self.st_atime is not None) and (self.st_mtime is not None):
self._flags |= self.FLAG_AMTIME
if len(self.attr) > 0:
self._flags |= self.FLAG_EXTENDED
msg.add_int(self._flags)
if self._flags & self.FLAG_SIZE:
msg.add_int64(self.st_size)
if self._flags & self.FLAG_UIDGID:
msg.add_int(self.st_uid)
msg.add_int(self.st_gid)
if self._flags & self.FLAG_PERMISSIONS:
msg.add_int(self.st_mode)
if self._flags & self.FLAG_AMTIME:
# throw away any fractional seconds
msg.add_int(int(self.st_atime))
msg.add_int(int(self.st_mtime))
if self._flags & self.FLAG_EXTENDED:
msg.add_int(len(self.attr))
for key, val in self.attr.items():
msg.add_string(key)
msg.add_string(val)
return
def _debug_str(self):
out = "[ "
if self.st_size is not None:
out += "size={} ".format(self.st_size)
if (self.st_uid is not None) and (self.st_gid is not None):
out += "uid={} gid={} ".format(self.st_uid, self.st_gid)
if self.st_mode is not None:
out += "mode=" + oct(self.st_mode) + " "
if (self.st_atime is not None) and (self.st_mtime is not None):
out += "atime={} mtime={} ".format(self.st_atime, self.st_mtime)
for k, v in self.attr.items():
out += '"{}"={!r} '.format(str(k), v)
out += "]"
return out
@staticmethod
def _rwx(n, suid, sticky=False):
if suid:
suid = 2
out = "-r"[n >> 2] + "-w"[(n >> 1) & 1]
if sticky:
out += "-xTt"[suid + (n & 1)]
else:
out += "-xSs"[suid + (n & 1)]
return out
def __str__(self):
"""create a unix-style long description of the file (like ls -l)"""
if self.st_mode is not None:
kind = stat.S_IFMT(self.st_mode)
if kind == stat.S_IFIFO:
ks = "p"
elif kind == stat.S_IFCHR:
ks = "c"
elif kind == stat.S_IFDIR:
ks = "d"
elif kind == stat.S_IFBLK:
ks = "b"
elif kind == stat.S_IFREG:
ks = "-"
elif kind == stat.S_IFLNK:
ks = "l"
elif kind == stat.S_IFSOCK:
ks = "s"
else:
ks = "?"
ks += self._rwx(
(self.st_mode & o700) >> 6, self.st_mode & stat.S_ISUID
)
ks += self._rwx(
(self.st_mode & o70) >> 3, self.st_mode & stat.S_ISGID
)
ks += self._rwx(
self.st_mode & 7, self.st_mode & stat.S_ISVTX, True
)
else:
ks = "?---------"
# compute display date
if (self.st_mtime is None) or (self.st_mtime == xffffffff):
# shouldn't really happen
datestr = "(unknown date)"
else:
time_tuple = time.localtime(self.st_mtime)
if abs(time.time() - self.st_mtime) > 15_552_000:
# (15,552,000s = 6 months)
datestr = time.strftime("%d %b %Y", time_tuple)
else:
datestr = time.strftime("%d %b %H:%M", time_tuple)
filename = getattr(self, "filename", "?")
# not all servers support uid/gid
uid = self.st_uid
gid = self.st_gid
size = self.st_size
if uid is None:
uid = 0
if gid is None:
gid = 0
if size is None:
size = 0
# TODO: not sure this actually worked as expected beforehand, leaving
# it untouched for the time being, re: .format() upgrade, until someone
# has time to doublecheck
return "%s 1 %-8d %-8d %8d %-12s %s" % (
ks,
uid,
gid,
size,
datestr,
filename,
)
def asbytes(self):
return str(self).encode()
Zerion Mini Shell 1.0